of
From LSJ
ἄνθρωπός ἐστι πνεῦμα καὶ σκιὰ μόνον → human being is only a breath and a shadow, man is but a breath and a shadow
prep.
About: P. and V. περί (gen.), V. ἀμφί (gen. or dat.). Of itself spontaneously: use adj., P. and V. αὐτόματος. What of that? P. and V. τί ταῦτα;